In game benchmarks we saw a ~38% performance gain by running a 2133MHz memory kit versus a 1333Mhz memory kit. This is a major performance gain and obviously shows that the AMD Radeon HD 7660D integrated graphics was being bottlenecked by the systems memory. If you ever plan on playing games with an APU powered system then you`ll want to go with the memory kit with the highest possible clock speed that you can afford..."